By Rashika Singh and Rae Wee (Reuters) -Global technology shares rallied on Thursday after Nvidia's blow-out quarterly results signaled that demand for artificial intelligence hardware remains strong even as concerns of the historic boom outpacing fundamentals linger. The chip bellwether'​s stellar results tempered some concerns over a potential AI bubble, although questions about the payoff from the massive spending boom remain. Nvidia ‌shares were up nearly 5% in premarket trading. If gains hold, the ...